Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e957ff807bd538a…

MALICIOUS

PDF

102.4 KB Created: 2021-04-28 11:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4401e2865cef6f8e2e105bc56ae9d7a4 SHA-1: bcf7c83d706ee6d4290f608ee94969942cce3af4 SHA-256: 9e957ff807bd538a35167412e4dc3e3ae7c6b86e816bd2c17107fa86329ecff9
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous embedded URLs, one of which points to a known malicious redirector, suggests a phishing or redirection attack. The document body contains garbled text, indicating it is not intended for human readability but likely serves as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/strik?utm_term=kemper+profiling+amplifier+powerhead+thoman In PDF document text
    • https://jufopikigon.weebly.com/uploads/1/3/4/3/134309667/rurejowixagunik-novoxokixasuniz.pdfIn PDF document text
    • https://cdn.sqhk.co/vomisape/gjahgjh/33994581694.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489598/normal_5fec3f0fa461b.pdfIn PDF document text
    • https://cdn.sqhk.co/bexoninodag/Pgg4lha/human_fall_flat_xbox_360_rgh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478687/normal_6047d61636e4f.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/dja7YzI/93748352852.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446507/normal_604cd00c023c9.pdfIn PDF document text
    • https://finuvowevemez.weebly.com/uploads/1/3/5/3/135397693/semerulilel_rovojiba_dibidi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495681/normal_6023bf021d871.pdfIn PDF document text
    • https://cdn.sqhk.co/pifajaloro/jcZ4E5k/ghostrunner_ps4_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/koxajavu/Bxggjb2/tiwupideli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484804/normal_60466b55c4db0.pdfIn PDF document text
    • https://lorufolirosob.weebly.com/uploads/1/3/4/5/134584190/5889321.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/tisof.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/galoga.pdfIn PDF document text
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_a86eb1618e214a79be06885dfe3a5151.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/21409e46-1e51-4d32-a65f-e74fed60495d/percy_jackson_the_lightning_thief_audiobook_chapter_11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7959429-7737-47ef-98d9-c14736802ace/mfc-7860dw_scan_driver.pdfIn PDF document text
    • https://8f1c0ae7-1ba6-4c51-a623-4d29f5e3aebb.filesusr.com/ugd/c1615c_c26bfd76ddbe43cea1c540c42b07f438.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c45d835f-06eb-4f67-a821-624edb91d34e/riwisipife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f9fcf0e-af37-4fb8-b042-6b89d546615b/keurig_2.0_maintenance_kit.pdfIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_0bf876ce46f0481ca7c48fd21cf3ed20.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3daa0f3b-795e-493d-a9bf-1cec48a7d426/voraburow.pdfIn PDF document text
    • https://0ed30ddb-3df1-4505-9e4e-3e87fc6d20ea.filesusr.com/ugd/f043c1_a0d6bff250c5475db4f096cdaee79fdf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/jujog.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15374 5340 bytes
SHA-256: 0ddea300106c8e5a54e813238fd1781986f1bcf20ba5a40b8ad057c6a267b829
font_01_sfnt_off00016588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16588 11284 bytes
SHA-256: e2fe471cea53c5fae297c73672b994f27f33dbfc8b19f0942814795fda6427a3

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